[Coco] mess HD problem

[Bill Nobel]

Yep I thought so emudsk itself doesn’t touch hpa from the descriptor at all, it’s hard coded for $FF8x,  so that won’t make a difference for Bob’s problem, unless he isn’t using emudsk.

Bill Nobel

> On Aug 6, 2014, at 7:00 PM, Bill Nobel <b_nobel at hotmail.com> wrote:
> 
> Hmm, Robert your post pointed out something I have wrong in my /DD descriptor.  Mine is currently set to $FFE0 and I’m using EmuDsk.  I do only use one vhd and everything works good.  I now need to look at the source now to see if hpa is even used.
> 
> Bill Nobel
> 
>> On Aug 6, 2014, at 5:09 PM, Robert Gault <robert.gault at att.net> wrote:
>> 
>> Bob Devries wrote:
>>> Hi all,
>>> 
>>> well, changing the port address to $FF80 appears to have fixed the problem.
>>> 
>>> I don't know how I came by a module with the incorrect hpa. Could it be that a
>>> previous version of emudsk used that address?
>>> 
>>> Thanks for your input everyone.
>>> 
>>> Regards, Bob Devries
>>> Dalby, QLD, Australia
>>> 
>> 
>> Bob,
>> 
>> Here is some info.
>> 
>> *Technical specs on Virtual Hard Disk interface Alan DeKok: JVC, MESS and VCC
>> 
>> *	Address       Description
>> *	-------       -----------
>> *	FF80          Logical record number (high byte)
>> *	FF81          Logical record number (middle byte)
>> *	FF82          Logical record number (low byte)
>> *	FF83          Command/status register
>> *	FF84          Buffer address (high byte)
>> *	FF85          Buffer address (low byte)
>> *       FF86          DR# 0=first drive 1=second drive; MESS only
>> 
>> Look at MESS/SRC/machine/coco_vhd.c
>> 
>> -----------------------------------------------------------------------------
>> *	The JV Coco3x has 2 .vhd drives with the second address set as:
>> *	Address       Description
>> *	-------       -----------
>> *	FFE0          Logical record number (high byte)
>> *	FFE1          Logical record number (middle byte)
>> *	FFE2          Logical record number (low byte)
>> *	FFE3          Command/status register
>> *	FFE4          Buffer address (high byte)
>> *	FFE5          Buffer address (low byte)
>> 
>> 
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>